화면 비율 계산기 (Aspect Ratio)
임의의 너비와 높이의 화면 비율을 계산합니다. 비율을 유지하며 크기를 조정하세요.
What is an Aspect Ratio?
An aspect ratio is the proportional relationship between width and height, expressed as W:H. Common aspect ratios include 16:9 (widescreen HD video and most monitors), 4:3 (older TVs and photos), 1:1 (square, Instagram posts), and 21:9 (ultrawide cinema).
This calculator reduces any width × height pair to its simplest ratio using the Greatest Common Divisor (GCD). It also calculates the new height when you scale to a different width.
일반적인 종횡비
| Ratio | Common Use |
|---|---|
| 16:9 | HD video, YouTube, most monitors |
| 4:3 | Traditional TV, classic photography |
| 1:1 | Instagram square, profile photos |
| 21:9 | Ultrawide cinema, gaming monitors |
| 9:16 | Mobile video (TikTok, Reels) |
| 3:2 | 35mm film, DSLR photos |
| 2:1 | Panoramic photography |
How to Resize While Maintaining Aspect Ratio
To resize an image while keeping its aspect ratio, fix one dimension and scale the other proportionally:
- Known width, solve for height: New Height = (Original Height × New Width) / Original Width
- Known height, solve for width: New Width = (Original Width × New Height) / Original Height
For example, to resize a 1920×1080 image to 1280 width: New Height = (1080 × 1280) / 1920 = 720. So 1280×720 is the correct 16:9 size.
자주 묻는 질문
What aspect ratio is 1920x1080?
1920×1080 has an aspect ratio of 16:9. This is the standard widescreen format used for HD video, YouTube, most computer monitors, and modern TVs. 3840×2160 (4K) is also 16:9.
How do I find the aspect ratio of an image?
Enter the image's width and height into the calculator. It will compute the simplified ratio. Alternatively, divide width by height to get the decimal ratio. 16:9 = 1.778, 4:3 = 1.333, 1:1 = 1.0.
What is the difference between aspect ratio and resolution?
Resolution is the total number of pixels (e.g., 1920×1080 = 2,073,600 pixels). Aspect ratio is the proportion (16:9). Two images can share the same aspect ratio but have different resolutions: both 1280×720 and 1920×1080 are 16:9.